Pneumatic tire spreader



Feb. 26, 1963 w. v. SORNSEN PNEUMATIC TIRE SPREADER Original Filed Jan. 25, 1961 3 Sheets-Sheet l (a INVHV TOR. 3; MLLAC: V. Sonuszu A TToRNEys MIIIZIIIII. H1 P I NJ W. V. SORNSEN PNEUMATIC TIRE SPREADER 3 Sheets- Sheet 2 Original Filed Jan, 23, 1961 I vllilllll ailllllllllllflfl! T Wm Wm A MN QM Q m\ WW5. QN

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5 NEW ATTORNEYS Feb. 26, 1963 w. v. SORNSEN e- 25,339,

PNEUMATIC TIRE SPREADER Original Filed Jan. 25, 1961 3 Sheets-Sheet 3 Q JNVENTOR. WALLAcs NZ Sonusew ATTORNEYS ttes tent Flee 1 25,339 PNEUMATHQ TERE SPREADER Wallace V. Sci-risen, Minneapolis, Minn, assignor to Paul E. Hawlrinson Company, Minneapolis, Minn, a corporation of Minnesota Original No. 3,043,565, dated July 10, 1962, Ser. No.

84,143, Jan. 23, 1961. Application for reissue Aug.

31, 1962, Scr. No. 221,658

4 Claims. ((Zl. 254'---5tl.4)

Matter enclosed in heavy brackets {IE appears in the original patent but forms no part of this reissue specification; matter printed in italics indicate the additions made by reissue,

My invention relates generally to improvements in pneumatic tire spreaders and more particularly to tire spreaders of the so-called inside arm type.

More specifically my invention relates to pneumatic tire spreaders of the type wherein the circumferentially spaced cooperating pairs of tire bead (or side wall) engaging spreader elements, as well as the arms upon which said spreader elements are mounted, are inserted into the opening defined by the .tire casing (as distinguished from around the tire) as an initial step. In spreaders of this type, it is therefore necessary to first move the spreader elements radially outwardly to cause engagement thereof with the beads and/ or side walls. Thereafter, it is necessary to impart axial spreading movements to the spreader elements to spread apart the beads and side walls of the tire. Heretofore entirely separate mechanical devices and arrangements have been utilized to move the spreader elements radially inwardly and outwardly with respect to each other, and axially toward and away from each other for the purpose of spreading or releasing the tire side walls.

The primary object of my invention is the provision of a device of the class described in which a single and highly novel mechanical arrangement of parts is utilized to successively achieve both the radial and axial spreading movements of the cooperating pairs of spreaderelements,

A further object of my invention is the provision of a device of the class immediately above described which may be motor driven, as distinguished from pneumatically or hydraulically, andconsequentially affords a maximum of safety to the operator.

A further object of my invention is the provision of a device of the class above described which'may be operated with a minimum of previous knowledge and/or skill.

A further object of my invention is the provision of a device of the class described which incorporates a minimum of working parts, is rugged and durable in construction, and may be produced at a relatively low cost.

The above and still further objects of my invention will become apparent from the following detailed specifi cation, appended claims, and attached drawings.

Referring to the drawings, wherein like characters indicate like parts throughout the several views:

FlG. l is a view in side elevation of my novel spreader;

HQ. 2 is an enlarged fragmentary view corresponding generally to MG. 1 but showing a different position of some of the parts thereof;

FIG. 3 is a view corresponding to FIG. 2 but showing a still different position of some of the parts;

FIG. 4 is a view in end elevation; and

FIG. 5 is a view in section taken on the line 5-5 of FIG. 1.

Referring with greater particularity to the drawings, numeral 1 indicates in its entirety a generally upright mounting pedestal, which is bored at its upper end portion to provide a horizontal bearing 2, Rigidly secured to the rear surface 3 of the pedestal 1, by any suitable means such as nut-equipped bolts 4, is a generally L- shaped mounting bracket 5. As shown, the vertical portion 6 of the mounting plate 5 is counterbored as at 7 for the non-rotative reception of the inner end of a tubular housing 8, which is concentric with the bearing 2 and has an internal diameter corresponding to that of the bearing 2. Rigidly secured to the extreme rear end of the tubular housing 8 is a tubular bearing 9.

Loosely received within the housing 8 is an elongated screw 19 the rear end portion 11 of which is journalled for rotation within the bearing 9. A conventional lock ring 12 locks the screw 19 against axial rearward movements. Fastened on the screw member 10, exteriorly of the bearing 9, is a sprocket 13. Entraincd over the sprocket 13 and the sprocket 14, associated with a reduction box 15 and a reversible electric motor 16 respectively mounted on the horizontal portion 6a of the bracket 5, is a chain 17 for purposes of imparting rotation to the screw element 10.

Shown as formed integrally with and projecting forwardly from the pedestal 2 is a tubular bearing boss 18. The forwardly projected end of the screw element 10 projects loosely through the bearing 2'ai1d bearing boss 18. Snugly received within the bearing 2 and the bearing boss 18 is a tubular traveller 19, the interior surface 20 of which has threaded engagement with the screw element 10. To positively preclude rotation of the traveller 19 with respect to the screw element 10, said traveller 19 at its rear end is formed to define a depending ear 21 which projects downwardly through an elongated axially ex tended slot 22 formed in the tubular housing 8.

With the mechanism described at this point, it should be obvious that rotation of the electric motor 16 in one direction will cause forward,'extendingmovernents to be imparted to the traveller 19 to a point where the car 21 engages a conventional limit switch 23; whereas'rotation of the motor 16 in the opposite direction will cause retracting movements to be imparted to the traveller 19 to a pointwhere said car 21 engages the limit switch 24. At its forward end the tubular bearing boss 18 is formed to define atrunnion 25 for rotative reception of a vertically disposed disc-like mounting plate 26. Rearward movements of the plate 26 are limitedby engagement with an annular flange 27 formed integrally with the bearing boss 18; whereas forward movements: thereof are limited by a conventional lock washer 28.

As shown, the mounting plate 26 is formed to define a plurality of radially outwardly opening slots 29. A plurality of mounting arms 30, one 'for each of the slots 29, have their inner end portions 31 slidably received within one of said slots 29. Preferably, the inner end portions of the arms 30 are provided with roller elements 32 which bear on opposite surfaces of the mounting plate 26 adjacent opposite sides of their respective slots 29, thereby limiting axial movements of the arms 30 while facilitating radial movements thereof.

As shown, the extensible and retractable traveller 19 projects forwardly from the mounting plate 26 and has rotatably mounted on its outer end a sleeve-like member 33 having circumferentially spaced axially extended radially projecting mounting flanges 34. Welded or otherwise rigidly secured to the outer end of the sleeve 33 and overlying the forward end of the extensible and retractable member 19, is a collar 35. The reduced solid forward end of the extensible member extends rotatively through the collar 35 and is provided with a nut, as at 36, to limit axially outer movements of the sleeve 33 and structure carried thereby.

At their extreme outer ends the mounting arms 30 are provided with tire side wall engaging spreader elements identified in their entireties by the numeral 37 and including enlarged heads 38 and shoes 39 which are rigidly fixed thereto. Mounted for axial sliding movements on the arms 39, intermediate the relatively fixed spreader elements 

